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If you're using MIDI, you should check out ScoreCleaner from DoReMIR. The developers are pretty enthusiastic about the possibilites of their own software (it detects key signature, time signature, tempo, voices, and rhythm & note values). However, since it new, it hasn't received that much attention yet.

You can check out some tutorials of it on Youtube (the first of them is posted below) or download a 14 day trial version on their homepage.